Water-tube boiler



Nov. 27, 1923- A. ROSS WATER TUBE BOILER Filed Aug. '31, 1921 2 Sheets-Sheet-l 3, m w/w w M Nov. 27 1923 I l,475;4 l 1 A. ROSS WATER TUBE 301 LEE Filed Au 31. 1921 2 Sheets-Sheet 2 Patented Nov. 27, 1923.

g p I 1,475,411 rurso STATES PATENT OFFICE.

ARTHUR ROSS, OF LONDON, ENGLAND.

WATER-TUBE BOILER.

Application filed August 31, 1921. Serial No. 497,270.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT L., 1313.)

To all whom it may concern:

Be it known that I, ARTHUR Ross, a subject of the King of England, residing in London, England, have invented certain new and useful Improvements in Water- Tube Boilers, for which I have filed application in Great Britain, No. 28,813, on the 13th December, 1913, and'of which the following is a specification.

This invention is for improvements in or relating to water-tube boilers of the type wherein the tubes are arranged in sets, ad jacent sets forming the legs of a V whereof the point is formed by aplurality of headers or drums connecting the two sets of tubes. To prevent confusion between the boiler constructions hitherto known and constructions according to the present invention, it is deemed advisable. to state here that this invention does not relate to boilers in which only one header is at the aforesaid point and that by the term set as applied to agroup of tubes in'this specification and its claim, it is intended to define tubes or rows of tubes which viewed in an end elevation such as Figure 1, hereinafter described, would appear in the plane of the paper as a plurality of tubes (as distinct from one tube or one row) in one leg of the V; for it is when a set of tubes as thus defined and also a plurality of headers at the point is present that difiiculties of inspection or repair ordinarily experienced are obviated by the present invention.

According to the invention a known type of polygonal water-tube boiler in which the water-tubes of each side of the polygonal figure are arranged in rows which extend perpendicularly to the plane of the polygonal figure, is improved by employing at the point of a V between adjacent sides of the polygonal figure, a plurality of headers (for example headers of square, circular or hexagonal cross-section) corresponding in number to the number of rows of tubes in a side, each header being connected to two rows of tubes, one at each side of the V, and the tubes on one side of the V being staggered in relation to those on the other side of the V; o

Inspection or tube-withdrawal openings Y are provided in the headers opposite tothe tubes leading therefrom, one such opening being appropriated to each tube-end.

' parts throughout the drawings.

For a mor complete understanding of the invention reference is directed to the accompanying drawin s.

In these drawi ngs Figure 1 is an end elevation of a portion of a Water-tube boiler, certain parts beingv diagrammatically illustrated in chain lines";

Figure 2 is a'front elevation, on a scale larger than that of Figure 1, of a-portion of a header belonging to the boiler shown in Figure 1, and its attached parts, a portion of the end of the header being'broken away to show'certa'in parts in section;

Figure 3 is an end elevation of the parts shown in Figure 2, and is partly in section on the line 3-3 Figure 2 and looking in the direction of the arrows at.

Like letters of reference refer to like A known type of boiler is in the shape of a four-sided figure arranged with one diagonal vertical and the other horizontal, and having at each corner a drum. The

sides of the four-sided figure areeach com-' posed of a series of water-tubes. In applying the present invention to a boiler of the type above described as being known the said drums will each be replaced by a set or plurality of headers A (Figure 1) which are shown as running, as to their own length, in a direction perpendicular to the plane of the four-sided figure. As will readily be understood each of these sets of headers A each V are staggered in relation to those on the other side of the V (see Figures 2 and 3) that is to'say the tubes of the'one set are staggered in relation to the tubes of the other set which would, otherwise, if

produced intersect and lie transversely-of. their ends and obstruct their removal or in-' spection.

The headers A may be arranged as closely together as is thought desirable. Conveniently, aS shown, the edges of the headers almost touch.

In alignment with the tubes B, and in the sides of the headers A opposite those from which the tubes lead, inspection openings A are preferably provided (see Figure 3). These are preferably of such a size as to enable the tubes to be withdrawn through them, and may be closed by any suitable cover, that shown in the drawings being one convenient form. Referring particularly to Figure 3 it will be seen that the cover is in two parts C and G whereof one part C is inside the header and the other part C out side the header. The parts 0 C are secured to the header by a bolt D, nut D and Washers D and are made to be concentric or approximately so with the opening A by a plate E carried by the bolt D and fitting in the opening A To enable the covers (l, C? to be mounted in position, and to allow of inspection of the headers, the ends of the latter may have openings fitted with suitable covers F (see Figure 2) mounted in place say by dogs F The openings closed by the covers F will be of such a size as to allow the parts C to be passed into the headers.

In Figures 1 to 3 headers A of square cross-section areshown, they being arranged with one diagonal vertical and with the tubes 13 extending at right angles to two adjacent inclined faces of the. headers. A four sided boiler arranged in this manner is suitable for many purposes and situations, but if'it is desired to employ a boiler of less total height, headers of circular or hexagonal cross-section may be employed.

It will be appreciated that it is in certain circumstances advantageous to replace a single large drum or header by a plurality of smaller headers, and with the arrangement according to the present invention this is done without impairing the accessibility of the tubes in the boiler. Owing to the staggering of the tubes of the sets in relation to other tubes which would otherwise have obstructed their removal or inspectionit is possible to inspect or to withdraw any tube without disturbing other tubes. Moreover the tubes may. be. straight which is a decided advantage in most circumstances.

The invention is of course not limited to the precise construction of boiler, hereinbefore described this may be mOdified without departing from the spirit of the invention.

What I claim as my invention and desire to secure by Letters Patent is:-

A polygonal water-tube boiler comprising a plurality of tubes arranged in sets, each set constituting the side of a polygon, and each set comprising a plurality of rows of tubes, a plurality of headers corresponding in number to the number of rows of tubes connecting together each the tubes in two rows at the point of the \1 formed by two adjacent sides of the polygon, the said rows of tubes extending each perpendicularly to the plane of the polygonal figure, thetubes in the one set being staggered in relation to the tubes of the other set as otherwise would obstruct their removal or inspection, each header having openings in alignment with the tubes in the sides of the headers opposite those from which the tubes lead.

In testimony whereof I afiix my signa- AR HUR ROSS- 

